content_decryption_module_export.h

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// Copyright 2017 The Chromium Authors. All rights reserved.

// Use of this source code is governed by a BSD-style license that can be

// found in the LICENSE file.

#ifndef CDM_CONTENT_DECRYPTION_MODULE_EXPORT_H_

#define CDM_CONTENT_DECRYPTION_MODULE_EXPORT_H_

// Define CDM_API so that functionality implemented by the CDM module

// can be exported to consumers.

#if defined(_WIN32)

#if defined(CDM_IMPLEMENTATION)

#define CDM_API __declspec(dllexport)

#else

#define CDM_API __declspec(dllimport)

#endif  // defined(CDM_IMPLEMENTATION)

#else  // defined(_WIN32)

#define CDM_API __attribute__((visibility("default")))

#endif  // defined(_WIN32)

// Define CDM_CLASS_API to export class types. We have to add visibility

// attributes to make sure virtual tables in CDM consumer and CDM implementation

// are the same. Generally, it was always a good idea, as there're no guarantees

// about that for the internal symbols, but it has only become a practical issue

// after introduction of LTO devirtualization. See more details on

// https://crbug.com/609564#c35

#if defined(_WIN32)

#if defined(__clang__)

#define CDM_CLASS_API [[clang::lto_visibility_public]]

#else

#define CDM_CLASS_API

#endif

#else  // defined(_WIN32)

#define CDM_CLASS_API __attribute__((visibility("default")))

#endif  // defined(_WIN32)

#endif  // CDM_CONTENT_DECRYPTION_MODULE_EXPORT_H_